78396533 has 2 divisors, whose sum is σ = 78396534. Its totient is φ = 78396532.

The previous prime is 78396509. The next prime is 78396589. The reversal of 78396533 is 33569387.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48344209 + 30052324 = 6953^2 + 5482^2 .

It is an emirp because it is prime and its reverse (33569387) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78396533 - 2²⁰ = 77347957 is a prime.

It is a super-2 number, since 2×78396533² = 12292032772840178, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78396133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39198266 + 39198267.

It is an arithmetic number, because the mean of its divisors is an integer number (39198267).

Almost surely, 2^78396533 is an apocalyptic number.

It is an amenable number.

78396533 is a deficient number, since it is larger than the sum of its proper divisors (1).

78396533 is an equidigital number, since it uses as much as digits as its factorization.

78396533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 408240, while the sum is 44.

The square root of 78396533 is about 8854.1816674383. The cubic root of 78396533 is about 427.9886832103.

The spelling of 78396533 in words is "seventy-eight million, three hundred ninety-six thousand, five hundred thirty-three".